摘要
Abstract
An excellent electrical technology product, electrical porcelain is widely used in power equipment.But during several earthquake research studies,we found that porcelain power equipment is highly vulnerable to earthquakes and any anti-seismic performance is difficult to enhance by means of structure optimization.As an important piece of seismic technology,the shear lead damper can effectively reduce the seismic response of electrical equipment.Nevertheless,the larger the electrical equipment,the stronger the seismic force that the electrical equipment can bear,which leads to a high demand for lead dampers.A low cycle reverse-loading experiment on a shear lead damper was conducted and the mechani-cal and damping characteristics at loading frequencies of 1 Hz,3 Hz,5 Hz and 7 Hz analyzed.The hys-teresis curves at different loading frequencies indicated that the restoring force model of the shear lead damper conforms to bilinear model modality;the pre-yield stiffness was 114.52~119.43 kN/mm,the post-yield stiffness 1.05~1.17 kN/mm,and the effective damping ratio value 40%~43%.When the loading frequency increased to 5 Hz or 7 Hz,the mechanical and damping properties of the shear lead damper were basically consistent with those at 1 Hz and 3 Hz.The initial and maximum yield forces,and the hysteresis loop area of the test increased with increased loading frequency,but the effective damping ratio was unaffected.The hysteresis loops from the 4 tests were not full and round,which affected the dissipation capacity of the damper and may be caused by the processing technology.According to the test results,the processing technology was optimized.The test hysteresis loop of an optimized damper was full,and the indexes of mechanical properties and energy consumption,and the damping characteristics all increased.All of the above can improve the performance of the damper and provides reliable technical support for the improvement of the seismic capacity of electrical equipment.关键词
电气设备/剪切型铅减震器/加载频率/性能分析/屈服力/有效阻尼比Key words
electrical equipment/shear lead damper/loading frequency/performance analysis/yielding force/effective damping ratio分类
建筑与水利
